Expansible drill-bit.



WITNESSES:

A. J. SNOW, I EXPANSIBLE DRILL BIT.

APPLICATION FILED JULY 23', 1913.

7 v d v1 BY 1%?? Patented May 5, 1914;

2 SHEETS-SHEET 1.

A. J. SN 6 W.

EXPANSIBLE DRILL BIT.

APPLICATION FILED JULY 23, 1913. I

' 1 Pmsnted May 5, 1914.

2 SHEETS-SHEET 2.

wgsms WITNESSE herei nui'ter UNITE TATE? PATENT @F Kljhl ALBERT 3'. SHOW, OF LGS ANGELES, CALIFORNIA.

EXBANSIBLE DRILL-BIT.

Application filed July 23.

Specification of Letters Patent.

State of California, have invented new and useful Improvements in Expansible- Drill Hits, of which the following is a specification.

This invention relates to tory bit.

The object of the present invention is to provide a simple, substantial and easily operated rotary hit, which is so constructed that the cutting tools\ will. be automatically opened out into cutting position when projected beyond the end or string of the Well ens'ng. it thus becomes possible to cut a sufiiciently large hole below-the casing. to permit the old casing be lowered or a new string to be inserted Without undue surface friction, V r

Another object of the present; invention is to provide a series of fluid conducting possages, so positioned zufito deliver fluid at or near the cutting-edges, thereby. greatly increasing the cut-tingpower of the tools by continuously removing the cuttings and helping to'remo ve the formation While the cutters are at work.

The, invention consists. ofthe parts and the construction and combination of parts as more fully described "and claimed, having referenc to the accompanying; drawings, in .vhieh Figure lis a ventral longitudinal. section or the drill. hotly, showing the cutting tools in the expanded or projected position. Fig. '2 is u similar-view, showing the tools in conirocted position. Fig, 8 is :1 section of :1 well showingthe position the cxpansihle rotary drill with relation to the casing. Fig. u sc -lion on lin 3px. Fig. l. Fig. is u-sectii.=n on line \'-V Fig. i, Fig. (5 is :1 poz's 'ioctiv'e View. portly in section and lll htll any. showing the slmpe oi the cuttingtool guide slots.

Whoren string of nosing hus been landed and it; noii'rssiiry to have 21 hug'er hole lie-- low than the inside (lltllllG'RY-Olli the casing [BHSll illlfillfill, or where it is desired to cue-r; string of casing; to 23 greater depth, t is m-ur W t have :1v larger hole than the outside r the (us ng in order to get clezir- :mwe and ov rc me fri tion. This has heroto' pro been urrrnuplishr i h lil'xi' drilling be low the casing and then onion-gin;

an expansible rothe hole by inserting an ckpunsihle iniderreainer. The object of the pn eut invention is to provide u rotary bit, which is so constructed that. the cutting tools will mitonmtzically eX- pond to thedesired diameter, when projected through the casing, thus eliminating the use of an underreiuner.

Referring to the drawings, A, indicates the main drill body, suitably secured, as'at 2, to a drill rod or tubing, indicated at 3. Slidably mounted in the drill body is a pair of rods 4 and 5, to the lower-ends of which is pivotally secured, as at 6, :1 pair of cuttin tools & and'fi. The lower end of the dril body is provided with a pair of upwardly extending slots and 8 into which the upperends 9 and 10 of the eutting); tools extend, The upper extensions 9 and 1001 the cutting tools provided with inclined facesill and 12, as indicated. in Figs. 1 and 2, and the inner ends of the slots 7 and 8 are similarly inclined for the purpose of guiding and securing the upper projections of the cutting tools-when these are positioned in the slots.

By referrin to the perspective view, Fig. 6, it Twill be seen that the drill body is provided with openings 4 and 5 in'which the rods 4. and 5 are elidanly mounted, and that siots 4 and 5 have been provided for the purpose of permitting fihe pin 6 to project through the rods 4 and 5 and projections 9 and 10, as indicated in Fig. 4. The slots 4 and 5 are of sufficient length to allow the extension. or expansion of the cutting tools, as indicated inFigs. 1 and 2.

The upper end of the drill body, to which the drill tubing 3 is secured. is provideiil With a. central chamber 13 in'to which the upper ends of the rods 4- nnd 5 project, The outer ends of these rods are threaded, ii.

adjustable nuts 14 and 1.5 which secure a. l cross plate 16, between which and the hottom of therchnniher 13 u single compression spring 17 is introduced. The'single compros-shin spring 17 positioned as here shown and surrounding the upper ends of the rods l 4 and 5 will distrilnitc an even up 'urd pull I on the rods and 5 and cause the cutting tool and 5 to assume the position indie l .ated in Fig. 1.

in operating an expansible rotary bit contiructed es here showmis is desirable to force fluid under pressure, say from fiftyto one hundred or more pounds pressure to the dicuted in l. and 2., and provided with square inch through the dril (iBl'JGilfllllg 'ings at u point just uluml of the midi.

. here shown is simple and solve-1i sintiul in (on upon the depth of the hole and the nature of the material being (llllltzd, for the purpose of removing the. cuttings of the tools and also for the purpose of removing euvings or other material. \Yith this oojeot in view I have provided. pair of fluid conducting; passages 18 and it) which extend from the annular chamber 13 to the lower eiuil of the drill body as indicated.

In operation, when it desired to lower thedrill through the casing. it only necessary to project the Cllhllilg tools into the position indicated in Fig. 2. This may be accomplished by pulling the cutting tools out from the supporting slots 7 and 8,.ugainst the pressure of. the spring 1'? and inserting the ends of the butting tools into the easing. In some instances u wire may be tied around the outer ends of the cutting tools to h0ld these in the extended contracted position until. the tool has been lowered. This will be quielzly cut through the moment the bit is rotated at't he lower eiul of the well, and the tools u re immediately allowed to expand and assume their normal position, indicated in Fig. l. lining expunileil and i'etmvteil iili-[ifi the guide slots T and 8 by the notion oi? the spring 17 and lli)l3('.k"(l rods i. and 5. The upper projections 9 and 10' contacting with tlie/iiirliiu-(l loves of the slots T and 8 will force the tools into the erqnuul-i-il position. The outer shoulders 21 extending through the slots 7 mu! 8 \\lll similarly engiw'e with the end of the k'HFllEL' :uul ori-o the one into. the i-onl'ruetuil pi: Him; shown in Fig. 2, when the (ll'lll is li'l'ti'il. thus :illowingg the (hill to he i-uuuix'eil :ii any lion;

in drilling :l hole with :1 rotary (ll'lil rig. water used us u 'Zlrill 21ml is .t-urceil down through the hollow ilrill tubing; i; into the rlmniher 1? lo hy lruulio 'l'ori'o. FY)!!! here the :ltGl pas es through the passing LS and 19 Mid is projerteil throuo l'i the lone openuilges of the tools. The projected lllllil under high pro. "in. will notonly lu-lp'to out and soften the formation but will also carry the cuttings to the oigiure.

An expzinsihlo i'ouU hit oonstruotetl as strnetion :n'ul reliulohrin its ions. imotically iiny desired iiliuineter mu he secured by increasing or decreasing the lhire of thooutting tools. and by drilling 21ml enlarging the hole in one o 'ieiotion consiileruhlu i'uno 1 "(.l .131 n the and expense are saved, thus 11103 01 the host of operation nnii tho eiiiv tool.

The nmteriuls and finish of the several. parts of the apparatus are such as experience uncl judgment of the nuinulzieturer may (lictote.

lilnving thus described my inrentifli. whet .l (ltllin and desire. to secure by Letters .iiitent is-- 1. In combination with main .ohcly itY- in u pan-of Spaced longitudinai in) mi and z lso hurlngslots which extend from so i openings toward the center of the body, sa d hoduulso having a pair of slots whivh :o'e

spring surrouruling both of the. upper enzls of the rods and seating at its lower oiul on the bottom all-oi the chamber and. means connecting the rods at their 'troine upper ends and loeing, engaged from lwneoth by the upper end of the spring.

9. In combination with :1 main body lliiT- ingii central recessed, portion zinil :1 pair oi longitudinal. openings wl'iicl. are located on opposite sides of the cent-mi recessed portion and connnunia'mte therewith, pair of rods slidahle in said respeotive longitiulinsil openings, a. pin connecting" the lower ends of said rods. 21 pair of outtino tools oivop ally mountorlon said pin 211w {BT21} ii in szihl revessecl portion, and unitary means for normally exerting npweru sion on hoth of the rods.

in combination with t. puii' of lon itudinal openings, 1i roi'l in each of said openin; nit-ans connection the ion mails oi wi l 'iOt'll-S 2i of out tors pii'otuily mounted on n'ienns. fli'u'i means to tension said rods to exert upvi'zu-i'l pull tl'iereoi'i. 1

in testimony whereof i have hereunto set my hmul in the presenvv of two suhscrilni z' witness s.

holly hurling u 

